Summary
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1.
The circadian rhythm of spontaneous optic nerve impulses from the isolated eye ofAplysia californcía was studied. A general hypothesis was investigated: light-dark cycles, which can entrainin vitro the rhythm from the eye, couple to the intracellular clock mechanism through membrane depolarization. This hypothesis was tested by exposing isolated eyes for fixed durations of time to a depolarizing stimulus, namely, elevation of K +0 (hi-K pulses).
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Depending on the phase of the rhythm in at which the eyes were treated, hi-K pulses produced either advance or delay phase shifts in the rhythm. A phase response curve was thus generated for 107 mM k +0 pulses of 4 hr duration.
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If the duration of the hi-K pulse was varied, keeping the phase at which the pulse started constant, the magnitude of the phase shift varied in a linear manner with the duration of the pulse.
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To examine the involvement of transmitter and neurohormone release in the production of the phase shifts, eyes were exposed to hi-K pulses in the presence of a medium (high Mg++, low Ca++) which should inhibit such release. Since only slight differences were observed in the phase shifts produced by hi-K and by hi-K in the presence of high Mg++, low Ca++, transmitter and neurohormone release do not appear to be involved in phase shift production by hi-K. It is likely that membrane depolarization alone is responsible for the phase shifts.
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Dedicated to Professor Jürgen Aschoff on the occasion of his 60th birthday for the important role he has played in generating the current interest in circadian rhythm research.
I am very grateful to Dr. Felix Strumwasser for providing excellent facilities for this research and for helpful suggestions during the course of this work and the writing of this manuscript. I thank Mr. Dave Peisner for his assistance in performing preliminary experiments on the effects of hi-K pulses on the eye ofAplysia. I thank Mr. James Gilliam for his skillful technical assistance and Drs. S. Arch, D. L. Wilson, and Mr. J. Ram for helpful discussions. This work was supported in part by USPHS Postdoctoral Fellowships (1-F2-GM-33,240-01 and 2-F02-GM-32,240,02) and grants from NIH (NS 07071), NASA (NGR 05-002-031), and the Alfred P. Sloan Foundation to Dr. F. Strumwasser.
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Eskin, A. Phase shifting a circadian rhythm in the eye ofAplysia by high potassium pulses. J. Comp. Physiol. 80, 353–376 (1972). https://doi.org/10.1007/BF00696434
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DOI: https://doi.org/10.1007/BF00696434